关键词: 天然风沙, 起动风速, 暴露度, 风洞试验

Abstract: The exposure degree conception used in research on water flow with non-uniform sands was applied for the blown sand jump-start study, and the exposure degree was analyzed by a statistical method. A formula used to compute the threshold wind velocity of non-uniform sediments was established, and it was tested by the wind tunnel experiment data. The results showed that the threshold wind velocity of non-uniform sediments was smaller than that of uniform sediments when their average diameters were similar. So, it is necessary to further study the method of using the average diameter to calculate the threshold wind velocity in formula of non-uniform sediments.

Key words: non-uniform wind sediments, threshold velocity exposure degree, wind tunnel experiment